Can not use icon

[l1tecoding]

I can not set icon from res://

this.map.addMarkers([
      {
        id: waypoint.waypointId,
        lat: waypoint.latitude,
        lng: waypoint.longitude,
        icon: "res://target",

        onTap: marker => this.$emit("edit-waypoint", marker.id),
      }
 ]);

  No icon found for this device density for icon ' res://icon'. Falling back to the default icon.

  Error: java.lang.IllegalArgumentException: Failed to decode image. The resource provided must be a Bitmap.